Functional block diagram of the DTIVA/LDi relay
General presentation
The DTIVA/LDi relay is an intelligent electronic device (IED) for protection and control dedicated to distribution lines. This relay performs complex protection, control and monitoring functions. It belongs to the DTIVA product family of the PROTECTA range. In hardware and software terms, this range is made up of modular devices. Because of this architecture, the modules are assembled and configured according to the user’s needs; from then on, the software determines the functions (SFB).
DTIVA products are configured to protect, control and supervise the components of public and industrial electrical distribution networks, including radial, ring and meshed distribution networks. Thanks to their modular architecture, the modules are assembled and configured according to the user’s needs; from then on, the software determines the functions.
The main fields of application are radial networks that are not directly earthed. In these cases, the use of Petersen coils or earthing resistors results in relatively low currents in the event of single-phase earth faults. Most protection functions rely on current measurement alone, but the integration of distributed generation or the presence of loops in the network topology calls for additional voltage measurements as well as directional protection functions. Distance protection and line differential protection are also available to protect compensated or isolated networks.
The EuroCAP configuration tool, available free of charge, provides a user-friendly and flexible application for protection, control and measurement functions, ensuring that the protection devices are fully customisable.
General features
- Native intelligent electronic device (IED) compliant with the IEC 61850 standard, Edition 2 compatible
- Scalable hardware adapting to different applications
- Rack width of 84TE or 42TE (height: 3U)
- The predefined factory configuration can be customised to the user’s specifications with the powerful EuroCAP tool
- Flexible protection and control functionalities to meet specific user requirements
- Advanced HMI functionalities via a colour touch screen and a built-in web server, extended measurement, control and monitoring functions
- User-configurable LCD displays, able to show single line diagrams (SLD) with switchgear position indication and control, as well as measurement values and several types of controllable objects.
- Various protection setting groups available
- Enhanced circuit breaker monitoring and control
- High-capacity disturbance recorder (DRE) and event logging (data stored in non-volatile memory):
- DRE supporting up to 32 analogue signal channels and 64 digital signal channels.
- The event recorder can store more than 10,000 events.
- Several mounting methods: rack-mounted; flush-mounted; semi-flush-mounted; wall-mounted; wall-mounted with terminals; flush-mounted with IP54-rated cover.
- Wide range of communication protocols
- Ethernet communication: IEC 61850; IEC 60870-5-104; DNP3.0 TCP; Modbus TCP
- Serial communication: DNP3.0; IEC 60870-5-101/103; MODBUS, SPA
- The PROTECTA range can handle several communication protocols simultaneously.
- Built-in self-monitoring function to detect internal hardware or software errors.
- Various time sources available: NTP server; minute pulse; legacy protocol master; IRIG-B000 or IRIG-B12X
Applications
The DTIVA/LDi relay provides combined distance and line differential protection for medium voltage networks.
Its range of functions covers all current- and voltage-based applications (directional overcurrent and earth fault protection, power calculation, overvoltage, undervoltage and frequency protection), including the distance protection and line differential protection functions.
All the control and monitoring functions required to control and monitor switchgear are integrated in the relay. The auto-reclosing function is supported by a synchrocheck.
Field of application
- Overhead lines and underground cables (back-up protection on HV networks) – overcurrent protection
- Directional detection of earth faults in isolated, resistance-earthed or Petersen coil-earthed networks, based on directional residual overcurrent protection
- Directional overpower and underpower protection with user-defined power values and tripping angles (combined solution for active or reactive power)
- Five independent distance protection zones with polygonal or MHO characteristics
- Handling of cross-country faults (phase preference can be set by parameter)
- Built-in fault locator function
- Line differential protection with current transformer saturation detection
- Transformers and compensation coils supported inside the protected zone
- Optional restricted earth fault protection
- Switchgear automation and control
- User-defined interlocking schemes
- Current transformer supervision through unbalance protection
- Sensitive directional detection of permanent earth faults
- Sensitive directional detection of transient earth faults (restriking, self-extinguishing)
- Inrush current detection and blocking
- Reverse power protection
- Distribution load-shedding schemes
- Protection against islanded operation of wind or photovoltaic installations
Protection and control functions
The DTIVA/LDi protection measures the three phase currents, the residual current as well as the three phase voltages and the residual voltage. In addition to the current- and voltage-based functions, these measurements allow the directional extension of the configured phase and residual overcurrent functions, the directional overpower or underpower functions, as well as frequency-based protection functions.
This relay has two main protection functions: the distance protection function and the line differential protection function. The set of functions is completed by the auto-reclosing function with synchrocheck.
Click on the link to download the general documentation : Please contact our Sales Department
Technical sheet : DTIVA NCA 25LA1051831 en
Click on the link to download the operation manual : Please contact our Sales Department
Click on the link to access the technical documentation to attach to your order : DOCACOM_PROTECTA
